Friction shock absorber



y 1946. s. B. HASELTINE 2,400,504

I v FRICTION SHOCK ABSORBER v Filed Jan. 27, 1944 Patented May 21, 1946 I ':z,400,504"; I T 1 RI HONYSHQ K.ABSOWEREIE .1

' f Stacy B. Haseltine, "-La Grange, lllly 'assignoii to I a H.Minerg' Incq chicago,11]., -a:corporation;- of Delaware v Application January 27, 1944, Serial Noi,5l9,892

3 Claims. (Cl. 267--9)1: 1 Y Y .This invention relates to improvements in l l!l, The transverse upper end walls of the friction shock absorbers, especially. adaptednfor openings l 2 -I 2 wprovid horizontalfstop shoulsnubbing or damp n the" action of. railway d r 'f B 43 for a purpose hereinafter pointed car truck springs. f out. ,';Atjtl'1 e vu'p'per"end, the casing is provided Qne pbject-of the invention to provide a 6 with inwardly extending guide slots 'l4-;l4 at friction fshock absorber. forsnubbinglthe action diametrically opposite' sides,,thereof, said [slots of ,trucl; springs of railway cars, comprising being o'penat theirfunpen ends. As, shown in frit'iori easin a eooperating, inh e l re ilif- Figure lggthei longitudinal .axesof the slots; I ne 11 e i' b Q Q be having sliding lie-ima'central vertical plane, which .isparallel rri tio arengagement with nth a a toith'e plan s ofthe frictionsurfacesill-=10. f.

spring resi tance elementfoppqsm r ati e id rh' upp r follower. B; islin the form of disc s m veme t of h casing an f i im hayih ga laterallyprojecting, annular flange l5 ber, wherein he ric i n l reslstance. P d of lesser thickness than the central main body of is a substantially constant during all phase of saidfdig j 1 l v f operation of the device. v 15 [Depending from the central portion of the mq speclfic oblect, o h lnventlqn .5 9 disclilreffollowrB isa transversely disposedeye pr t o Shock absorber, a litte y member iaiwhi 'h is vertically aligned withthc the z cg pe e i he slotsd'de-ldoffthe' casing Afand is adapted to 9 9 5 rmy q r 9 r 95 2 J travel. in said slots. as the" follower. B is moved ns v ext n a'm w r q n surfacgsi n axiallytowardthe casing. 7 e." fi c n b r e frictio member drain the form or a f a P spring fiha h ar U ha' ed resilient steel la 0 rectan' ular cross thereqf sliding j tmg gtm i iwiih 's ctlbr? jbmprising spa ed pirallel, side arms f fnctlon,.surfaces 'i ge lngi- 1 I" l l 1lll the form of sllb stagntially flat platesec fother tt of the mvfmtlon wllnporepleaxly tions and a curved. section l8 connecting said g am? t a #t hemml arfiis at their 'ubprefias The section- I8 is a er oowmg. yr c t 7 s11 htl thicker. than the arms 'l.'|l1an 3 en- In t e w formmg V part of thhsi Speclfi' gaged through the open'ing of theeye nmbr cation,Figure 1 is a' transverse vertical sec- 's is s t gn tional view of the improved frlction shock abmember of the eye '6 and the upper side of the Sorber' Figure 2 is a horizontal sectional View curved section l8 abuts the underneath surface t' h lne 2-2 correspondmg substan lauy to t e 1 of of the follower B,whereby said friction member F'i ure 1. Fi ure- 3 is a top lan view of Fig- Figurge 4 is an elevatgonal View of the C 1s fixedto the follower B for movement m umson therewith.

f n h d shock ab orb not) casing of t 6 Improve 5 er The arms I 1-H of the member C extend into ok' 0 eft toriht'nFiure 1. v 1 0 mg fr m 1 g 1 g the casing A and have sliding frictional engage-v My improved shock absorber comprises broadly a fricti casing an upper f ll r ment with the friction surfaces l0l0 of the B; a U-shaped friction member C carried by the latterfonower B and Slidable Within the casing; and 40 The lower ends of the arms are turned laterally a spring D opposing relative movement of the outwardly, thereby providing stop 8' 1 casing and fri tion member which engage underneath the shoulder |3|3 h casing A is in t fgrm of a cylinder of the casing to limit outward movement of the ing two opposed, interior, flat friction surfaces friction member C and the associated follower l0l0 extending lengthwise thereof. The fric- B d hold the mechanism assembled. tion surfaces l0l0 are at the upper end of the The spring D comprises a ingle heavy coil surcasing, as shown in Figure 1,, and are preferably rounding the casing A and having its top and parallel to each other. At the base thereof, the bottom ends bearing respectively on the flange casing A is provided with a laterally projecting, l5 of the follower B and the flange ll of the annular flange H, which forms the lower fol- 50 casing A. The spring D is preferably under ini' lower member of the device. tial compression.

The side wall of the casing A is provided with The U-shaped spr plate friction member relatively large, substantially rectangular openthrough its spring action, has a tendency to exings l2l2 at diametrically opposite sides of pand, thus holding the arms thereof in tight fricthe same, inwardly of the friction surfaces tional contact with the friction surfaces of the casing and maintaining the stop lugs |9l9 in cooperative relation with the shoulders l3-l3.

Inasmuch as the U-shaped friction member C is in the form of a resilient spring plate, the arms thereof may be flexed toward each other so that the lugs l9l9 will clear the friction surfaces of the casing to permit telescoping of the arms within the casing in assembling the parts of the mechanism. q a j v j 1 7 My iniprovea shock absorber preferably re places one of the spring units of a truck spring cluster, being interposed between the top and boti ,ient, flat, straight, platelike arms telescoped within the casing in sliding engagement with the frictom spring follower plates of said cluster. Howe ever, as will be evident to those skilled in this art, several of these improved shockabsorbers, may be.

used in a single spring cluster, replacing two or more units of the same. In order to accomthat come within the scope of the claims appended hereto.

I claim:

1. In a friction shock absorber, the combination with a cylindrical friction casing having interior, longitudinally extending, opposed, flat friction surfaces at one end thereof and an integral follower member at the other end thereof; of a follower, movable axially, toward the end of the casing having the friction surfaces; a U-shaped friction spring member movable in unison with said follower, said member having a pair of resiltion surfaces thereof rand a coil spring surroundingsaid casing and bearing at its opposite ends on on a well-known form of spring follower plate,

the follower B and the base portion of the casing A are provided with openings 20--20.

The operation of th improved shock absorber is as follows: Uponlthespring cluster of the truck of a railway car being compressed between the spring follower plates of said cluster, the follower B and the casing A will be moved toward each other against the resistance of the spring D, the U-shaped member C bein moved in unison with the follower During this action, the arms l|- |'I of'the resilient U-shaped friction member are forced to slide inwardly of the friction casing A along the friction" surfaces lll- -lll thereof, thereby snubbing the action of the truck springs. Upon recoil of the truck springs, thespring D is free to expand and return all of the parts'tc' normal positionjoutward movement'of the U -shaped member and follower B being limited'by thestop said follower member and follower.

2. In a friction shock absorber, the combination with a lower friction casing having opposed,

lugs |9' l 9 of the'member'B coming into engage- I ment with theshoulders 13-43 of the casing.

As will be evident, 'the'frictional resistance provided by my improved shock absorber remains substantially constant during both compression and expansion of them'echanismthus providing the desired snubbingaction in both compression and recoil of the truck'spring's.

I have herein shown and described what I now 'considerfthe preferred mannerof carrying out my invention, but thesa'meis merely illustrative and I contemplate all changes and modifications interior friction surfaces at the upper end thereof; of a base flange on said casing; an upper follower, said upper follower and casing being movable toward and away from each other in vertical direction; a depending eye on said upper follower integral therewith; diametrically opposite guide slots in said casing cooperating with said eye to slidingly guide the same; a U -shaped spring plate member engaged through said eye and having depending platelike friction arms slidably engaged with the interior friction surfaces of the casing and a coil spring surrounding said casing and having its top and bottom ends bearing respectively on said upper follower and base flange of the casing.

3. In a friction shock absorber, the combination with a friction casing having longitudinally extending, interior friction surfaces; of a resilient U-shaped friction member having the arms thereofin sliding'frictional engagement with the friction surfaces of the casing, said casing and member being movable towardand ,away from each other in lengthwise direction, said arms having outturnedhooked ends; shoulders on said casing engageable by said hooked ends to limit longitudinal separation of said casing and member; and spring means yieldingly opposingrelative movement of said casing and member toward each other. 1 I

1 STACY B. HASELTINE. 

